When an HVAC contractor tells you that your AC unit needs a major repair, you face one of the most common — and expensive — decisions a homeowner makes: pay for the repair, or replace the whole system? Here’s how to think through it without relying entirely on a salesperson’s recommendation.
The Two Variables That Matter
Almost every repair vs. replace decision comes down to two things:
- Age of the system
- Cost of the repair relative to replacement cost
The 50% Rule
If a repair costs more than 50% of the cost of a new system, replacement almost always makes more financial sense. New systems come with warranties (typically 10 years on the compressor), are more efficient, and don’t have the other aging components that are likely to fail next.
Example: If a new AC installation in Kansas City would cost $5,000–$6,000, and the repair quote is $2,800 — you’re in replacement territory, especially on an older unit.
The Age Factor
Apply the 50% rule with the age of the system as a multiplier:
- Under 8 years old: Favor repair unless the repair is very expensive
- 8–12 years: Evaluate case by case using the 50% rule
- 13–15 years: Lean toward replacement for anything but small repairs
- Over 15 years: Replace unless the repair is trivial (under $300)
The R-22 Wildcard
If your unit uses R-22 refrigerant (the old Freon standard, phased out in 2020), a refrigerant leak is an automatic replacement situation. R-22 is now scarce and expensive — a recharge alone can cost $600–$1,500 — and you’d still have the underlying older unit.
Efficiency Difference Matters Too
Units manufactured before 2010 typically have SEER ratings of 10–12. Modern minimum-efficiency units are SEER 14–16; high-efficiency units hit 20–25. If you’re in Kansas City running your AC hard from May to September, improving from SEER 10 to SEER 18 can reduce cooling costs by 40–45%. Factor that into your decision over a 5-year horizon.
How to Protect Yourself from a Biased Recommendation
Some HVAC technicians earn higher commissions on equipment sales than service calls. To protect yourself:
- Get a second opinion on any repair quote over $800
- Ask the technician to show you the failed component and explain why it can’t be repaired
- Ask what the expected remaining life of the unit is after the repair
- Ask specifically whether the repair has a labor and parts warranty, and for how long
We send you one pre-screened licensed contractor — no revolving door of salespeople. Request a free assessment here.